I don’t want to look like promotional, but recently a professor used an Osmo reflector (https://twitter.com/romps/status/1237617042338897921?s=12) to project class notes and it caught on with teachers.

A team worked through the weekend and released a free app to make this super easy (https://twitter.com/PlayOsmo/status/1241152565083090947).

While the base + reflector is not free, if you already have an Osmo game at home, you can reuse that.